Ошибка в MouseListener java

Question

Я разрабатываю «игру», и у меня есть проблема при нажатии на холст. KeyManager не загружается и сбой. Но когда вы пытаетесь загрузить его с помощью KeyEvent, он работает нормально.

Мой код:

//Click Event 
public class MouseManager implements MouseListener { 

    private GameState gameState; 
    private Game game; 

    public boolean enter; 

    public MouseManager(){ 

    } 

    @Override 
    public void mouseClicked(MouseEvent e){ 
     if (State.getState().toString().contains("MenuState")) { 
      for (int x = 187; x < 287; x++) { 
       for (int y = 400; y < 430; y++) { 
        if (e.getX() == x && e.getY() == y) { 
         this.gameState = new GameState(this.game); 
         State.setState(this.gameState); 
         break; 
        } 
       } 
      } 
     } else { 
      return; 
     } 
    } 

    @Override 
    public void mouseEntered(MouseEvent e){ 
    } 

    @Override 
    public void mouseExited(MouseEvent e){ 
    } 

    @Override 
    public void mousePressed(MouseEvent e){ 
    } 

    @Override 
    public void mouseReleased(MouseEvent e){ 
    } 
} 

    //Game State class 

    public GameState(Game game){ 
     super(game); 
     this.player = new Player(game, 100.0F, 100.0F); 
     this.friend = new Friend(100.0F, 100.0F); 
     this.world = new World("res/worlds/world1.txt"); 
    } 

//State class 

private static State currentState = null; 
protected Game game; 

public static void setState(State state){ 
    currentState = state; 
} 

public static State getState(){ 
    return currentState; 
} 

public State(Game game){ 
    this.game = game; 
} 

public abstract void tick(); 

public abstract void render(Graphics paramGraphics); 

//GameState class 

public class GameState extends State { 

private Player player; 
private Friend friend; 
private World world; 

public GameState(Game game){ 
    super(game); 
    this.player = new Player(game, 100.0F, 100.0F); 
    this.friend = new Friend(100.0F, 100.0F); 
    this.world = new World("res/worlds/world1.txt"); 
} 

public void tick(){ 
    this.world.tick(); 
    this.player.tick(); //line 25 
    this.friend.tick(); 
} 

public void render(Graphics g){ 
    this.world.render(g); 
    this.player.render(g); 
    this.friend.render(g); 
} 

//Player 

public class Player extends Creature { 

private Game game; 
private int onMoveDown = 0; 
private int onMoveUp = 0; 
private int onMoveLeft = 0; 
private int onMoveRight = 0; 

public Player(Game game, float x, float y){ 
    super(x, y, 64, 64); 
    this.game = game; 
} 

private void getInput(){ 
    this.xMove = 0.0F; 
    this.yMove = 0.0F; 
    float vol = -40.0F; 

    SpriteAngel angel = new SpriteAngel(ImageLoader.loadImage("/sprites/angel.png")); 

    if (this.game.getKeyManager().up) { //line 31 
     this.yMove = (-this.speed); 

     onMoveLeft = 0; 
     onMoveRight = 0; 
     onMoveDown = 0; 

     if (onMoveUp == 6) { 
      Assets.player = angel.crop(80, 192, 80, 64); 
     } 
     if (onMoveUp == 12) { 
      Assets.player = angel.crop(160, 192, 80, 64); 
     } 
     if (onMoveUp == 15) { 
      Assets.player = angel.crop(240, 192, 80, 64); 
     } 
     if (onMoveUp == 21) { 
      onMoveUp = 0; 
     } 
     onMoveUp++; 
     Sounds.playSound("res/sounds/walk.wav", vol); 
    } 

    if (this.game.getKeyManager().down) { 
     this.yMove = this.speed; 

     onMoveLeft = 0; 
     onMoveRight = 0; 
     onMoveUp = 0; 

     if (onMoveDown == 6) { 
      Assets.player = angel.crop(80, 0, 80, 64); 
     } 
     if (onMoveDown == 12) { 
      Assets.player = angel.crop(160, 0, 80, 64); 
     } 
     if (onMoveDown == 15) { 
      Assets.player = angel.crop(240, 0, 80, 64); 
     } 
     if (onMoveDown == 21) { 
      onMoveDown = 0; 
     } 
     onMoveDown++; 
     Sounds.playSound("res/sounds/walk.wav", vol); 
    } 

    if (this.game.getKeyManager().left) { 
     this.xMove = (-this.speed); 

     onMoveRight = 0; 
     onMoveUp = 0; 
     onMoveDown = 0; 

     if (onMoveLeft == 6) { 
      Assets.player = angel.crop(80, 64, 80, 64); 
     } 
     if (onMoveLeft == 12) { 
      Assets.player = angel.crop(160, 64, 80, 64); 
     } 
     if (onMoveLeft == 15) { 
      Assets.player = angel.crop(240, 64, 80, 64); 
     } 
     if (onMoveLeft == 21) { 
      onMoveLeft = 0; 
     } 
     onMoveLeft++; 
     Sounds.playSound("res/sounds/walk.wav", vol); 
    } 

    if (this.game.getKeyManager().right) { 
     this.xMove = this.speed; 

     onMoveLeft = 0; 
     onMoveUp = 0; 
     onMoveDown = 0; 

     if (onMoveRight == 6) { 
      Assets.player = angel.crop(80, 128, 80, 64); 
     } 
     if (onMoveRight == 12) { 
      Assets.player = angel.crop(160, 128, 80, 64); 
     } 
     if (onMoveRight == 15) { 
      Assets.player = angel.crop(240, 128, 80, 64); 
     } 
     if (onMoveRight == 21) { 
      onMoveRight = 0; 
     } 

     onMoveRight++; 
     Sounds.playSound("res/sounds/walk.wav", vol); 
    } 

    if (this.game.getKeyManager().shift) { 
     setSpeed(DEFAULT_SPEED + 1.7F); 
    } else { 
     setSpeed(DEFAULT_SPEED); 
    } 
} 

public void tick(){ 
    getInput(); //line 132 
    move(); 
} 

public void render(Graphics g){ 
    g.drawImage(Assets.player, (int) this.x, (int) this.y, null); 
} 

//Game.java:53 

    private void tick(){ 
    this.keyManager.tick(); 
    this.mouseManager.tick(); 
    if (State.getState() != null) { 
     State.getState().tick(); 
    } 
} 

Ошибка на линии

if (this.game.getKeyManager().up) { 
      } 

погрузчик класса

this.display.getCanvas().addMouseListener(this.mouseManager); 

Ошибка

Exception in thread "Thread-0" java.lang.NullPointerException 
    at com.gmail.cadox8.deud.entities.creatures.Player.getInput(Player.java:31) 
    at com.gmail.cadox8.deud.entities.creatures.Player.tick(Player.java:132) 
    at com.gmail.cadox8.deud.states.GameState.tick(GameState.java:25) 
    at com.gmail.cadox8.deud.Game.tick(Game.java:53) 
    at com.gmail.cadox8.deud.Game.run(Game.java:89) 
    at java.lang.Thread.run(Unknown Source) 

// Edited Код

Answer 1

Ваш mouseClicked() является своего рода странно, я думаю, что вы имеете в виду

@Override 
public void mouseClicked(MouseEvent e){ 
    if (State.getState().toString().contains("MenuState")) { 
     if (e.getX() >= 187 
     && e.getX() < 287 
     && e.getY() >= 400 
     && e.getY() < 430) { 
       this.gameState = new GameState(this.game); 
       State.setState(this.gameState); 
      } 
     } 
    } else { 
     return; 
    } 
} 

Но это, вероятно, не является причиной вашей проблемы, посмотрите в Game.java:89 для Whats ноль.

Answer 2

при регистрации вашего мышиListener попробуйте его следующим образом: .addMouseListener (this); Я как бы новичок в этом сам, но, похоже, я делал это так в прошлом.